Multiple routes per certificate or SAN support

[MikeEdgar]

I see in the architecture documentation a reference to SANs, but it's not clear to me how to request them. Looking through route.go it seems that only the Route's host name is used in the order/request. The issue I am facing is the domains for my service are too long for the CN value and I would like to set them as SANs. Ideally, a single multi-SAN certificate could be issued for use by the individual routes.